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Inventories (Tables)
 9 Months Ended
Sep. 30, 2012
Inventory [Abstract]  
Changes in the Inventory Reserves
                                 
    Nine Months Ended
September 30,		     Three Months Ended
September 30,		  
    2012     2011     2012     2011  
          (In Thousands)        

Balance at beginning of period

   $ 1,783     $ 1,793     $ 1,737     $ 1,988  

Provisions for losses

     337       1,351       293       1,072  

Write-offs and disposals

     (93 )      (85 )      (3 )      (1 ) 
   

 

 

    

 

 

    

 

 

    

 

 

  

Balance at end of period

   $ 2,027     $ 3,059     $ 2,027     $ 3,059